Octave: Empty plots (after “figure”)
Running Octave 4.2.2 on Linux Mint 19, I got plots with nothing in them occasionally. Solution: Change the graphics toolkit to GNU Plot.
Simply put, add ~/.octaverc reading
graphics_toolkit("gnuplot")
and rerun Octave.
By the way, for zooming in, right-click the mouse on the first point, and left-click on the second.